Aluminum PCBs for LEDs

Aluminum PCBs efficiently transfer heat generated by high-power LEDs away from the junction, preventing thermal degradation and extending LED lifespan. Their thermal resistance is significantly lower than FR4 (which ranges 20–22°C/W at 1.5mm), enabling LEDs to operate at higher power densities without overheating, reducing the need for external heat sinks and bulky hardware.

SFX PCB's aluminum PCBs are available in copper thicknesses ranging from 35µm (1 oz) to 210µm (6 oz), with circuit layer copper weight options from 1 oz to 10 oz. Specific options include 35µm, 70µm, 105µm, 140µm, 175µm, and 210µm, allowing designers to match current-carrying and thermal requirements of their LED application.

Available surface finishes for aluminum PCBs include HASL (Hot Air Solder Leveling), ENIG (Electroless Nickel Immersion Gold), OSP (Organic Solderability Preservative), and Immersion Silver. Each finish offers different solderability, oxidation resistance, and thermal performance characteristics. ENIG is particularly popular for fine-pitch LED component soldering due to its flat, reliable surface.

SFX PCB manufactures aluminum PCBs from a minimum size of 5×5mm up to a maximum of 1200×480mm. Board thickness ranges from 0.5mm to 5.0mm, with a dielectric layer thickness between 50µm and 200µm. The minimum hole diameter is 0.6mm and minimum trace width/spacing is 0.1mm/0.1mm, supporting a wide range of LED module designs.

Yes, aluminum PCBs are widely used in automotive LED lighting including headlights, interior lighting, and dashboard backlighting. Their excellent thermal management, mechanical durability, and dimensional stability (warp and twist ≤0.5%) make them suitable for the vibration, temperature cycling, and compact packaging demands of automotive lighting systems.

Aluminum PCBs offer significantly superior thermal performance compared to FR4. FR4 boards have thermal resistance of 20–22°C/W at 1.5mm thickness, while aluminum PCBs offer far lower thermal resistance through a thermally conductive dielectric layer. Additionally, aluminum provides better mechanical rigidity and dimensional stability, though aluminum PCBs are slightly higher in cost than standard FR4 boards.